This patch adds a handful of cond_resched() points to a number of key,
scheduling-latency related non-inlined functions.

This reduces preemption latency for !PREEMPT kernels.  These are scheduling
points complementary to PREEMPT_VOLUNTARY scheduling points (might_sleep()
places) - i.e.  these are all points where an explicit cond_resched() had
to be added.

Has been tested as part of the -VP patchset.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>